SOLUTION: riza is 25 when her first son was born,today the sum of their ages is 105.how old is riza and her son now?

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Question 205213: riza is 25 when her first son was born,today the sum of their ages is 105.how old is riza and her son now?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Let b be the age of the son
let r be riza's age
r+=+b+%2B+25
Given r+%2B+b+=+105
%28b%2B25%29+%2B+b+=+105
2b+%2B+25+=+105
2b+=+80
b+=+40
Her boy is not 40. Since she is 25 years older than he, Riza must be 65.
Just don't tell her friends, Riza tells them she is 51 ;).